Rowing has been practiced for millennia and became a competitive sport in the 17th century with regattas held over distances like 1.2 nautical miles. Two famous amateur rowing events are The Oxford and Cambridge University Boat Race watched annually on TV by 700 million viewers in 2017 and rowing versus canoeing where rowing uses oars with a helmsperson and free oars while canoeing uses paddles. Rowing regulations for competitions include Olympic tests over a 2000 meter course in six lanes and separates competitions into male and female categories including lightweight and heavyweight classes defined by specific weight limits. The two main styles of rowing are mobile seat rowing using carbon fiber materials and seat rails and fixed seat rowing